Connector and power supply unit with safety mechanism

A pair of connectors, comprising:

• a male connector including a control pin and power pins to receive electric power;
• and
• a female connector, including:
• two power supply sockets configured to mate with the power pins to supply the electric power to the power pins;
• two relays connected to the two power supply sockets, respectively, to control supply of the electric power;
• a control socket configured to mate with the control pin;
• two control electrodes situated in the control socket to control opening and closing of the two relays,
• wherein the two control electrodes are electrically coupled to each other through the control pin upon mating between the female connector and the male connector, the electrical coupling of the two control electrodes causing the two relays to be closed to supply the electric power to the two power supply sockets.